You know what, we won't even go through the drill of expressing surprise that a new major version of Firefox is released on a nearly-monthly basis. Mozilla released Firefox 8.0, about 7 months after it released Firefox 4.0. And they look similar, except that the new one looks more polished. Granted, drastic UI changes can hit users' learning curve and preferences. The new UI sports essentially the same layout as its predecessors since version 4.0, but the elements look designed better, fused into the theme. It's the under-the-hood changes that are counting. Mozilla would never pack so many background changes to the monthly updates of Firefox 3.